I don't have any links, but I heard it on the radio yesterday. It's something to do with female dogs ovulating randomly, and not being able to stimulate ovulation via hormones.

Just found this article which discusses it: http://www.rferl.org/featuresarticle/2005/08/a696a224-e655-4dea-acce-12bed08c63be.html

Incidentally the company is partnering with Hwang Woo-suk, who was behind the cloning fiasco in South Korea, making various unsupported claims!
http://en.wikipedia.org/wiki/Hwang_Woo-Suk